The EZ-FLO Return Air Filter Grille is designed for wall or ceiling openings on central air system plenums for mounting an air filter. It is made of heavy-duty steel with a white powder-coated finish that resists flaking and rust for a longer-lasting performance. It fits a rough duct opening 30 inches wide by 10 inches long. It features slotted vanes that are non-adjustable and in a fixed position and a hinged panel with two latches for easy air filter replacements. Includes (4) screws for easy installation. This return air filter grille accepts most 30-inch by 10-inch air filters. It is important to check the duct opening size before purchasing a return air filter grille.. Designed for openings 30 in. long by 10 in. wide. For mounting air filter on HVAC plenum. Suitable for wall or ceiling openings. Color: White. Color Family: Whites. Features: Flush Mount,Louvered. Installation Location: Ceiling,Floor,Wall. Material: Steel. Maximum Duct Opening Length (in.): 10 in. Maximum Duct Opening Width (in.): 30 in. Pack Size: 1. Product Weight (lb.): 1 lb. Outside Length (in.): 10. Outside Width (in.): 30